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Reserve for Claims and Claim Expenses (Schedule of Liability for Unpaid Claims and Claims Adjustment Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Reserve for claims and claim expenses, net of reinsurance recoverable, as of beginning of period     $ 7,455,128 $ 6,593,052  
Net incurred related to:          
Current year $ 1,945,695 $ 995,907 3,393,828 2,078,639  
Prior years (147,650) (53,877) (208,711) (55,383)  
Total net incurred 1,798,045 942,030 3,185,117 2,023,256  
Net paid related to:          
Current year     250,395 191,213  
Prior years     1,282,895 1,293,014  
Total net paid     1,533,290 1,484,227  
Foreign exchange     (66,469) 39,904  
Amounts disposed     0 (155,178)  
Reserve for claims and claim expenses, net of reinsurance recoverable, as of end of period 9,040,486 7,016,807 9,040,486 7,016,807  
Reinsurance recoverable 4,192,758 2,883,808 4,192,758 2,883,808 $ 2,926,010
Reserve for claims and claim expenses as of end of period $ 13,233,244 $ 9,900,615 $ 13,233,244 $ 9,900,615